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Before the war, Boston had been the scene of much revolutionary activity, leading to the Massachusetts Government Act that ended home rule as a punishment in 1774. Popular resistance to these measures, however, compelled the newly appointed royal officials in Massachusetts to resign or to seek refuge in Boston. Lieutenant General Thomas Gage, the British Commander-in-Chief, North America, commanded four regiments of British regulars (about 4,000 men) from his headquarters in Boston, but the countryside was in the hands of the Revolutionaries.On the night of April 18, 1775, General Gage sent 700 men to seize munitions stored by the colonial militia at Concord, Massachusetts. Riders including Paul Revere alerted the countryside, and when British troops entered Lexington on the morning of April 19, they found 77 minutemen formed up on the village green. Shots were exchanged, killing several minutemen. The British moved on to Concord, where a detachment of three companies was engaged and routed at the North Bridge by a force of 500 minutemen. As the British retreated back to Boston, thousands of militiamen attacked them along the roads, inflicting great damage before timely British reinforcements prevented a total disaster. With the Battles of Lexington and Concord, the war had begun.

Before the war, Boston had been the scene of much revolutionary activity, leading to the Massachusetts Government Act that ended home rule as a punishment in 1774. Popular resistance to these measures, however, compelled the newly appointed royal officials in Massachusetts to resign or to seek refuge in Boston. Lieutenant General Thomas Gage, the British Commander-in-Chief, North America, commanded four regiments of British regulars (about 4,000 men) from his headquarters in Boston, but the countryside was in the hands of the Revolutionaries.On the night of April 18, 1775, General Gage sent 700 men to seize munitions stored by the colonial militia at Concord, Massachusetts. Riders including Paul Revere alerted the countryside, and when British troops entered Lexington on the morning of April 19, they found 77 minutemen formed up on the village green. Shots were exchanged, killing several minutemen. The British moved on to Concord, where a detachment of three companies was engaged and routed at the North Bridge by a force of 500 minutemen. As the British retreated back to Boston, thousands of militiamen attacked them along the roads, inflicting great damage before timely British reinforcements prevented a total disaster. With the Battles of Lexington and Concord, the war had begun.

The militia converged on Boston, bottling up the British in the city. About 4,500 more British soldiers arrived by sea, and on June 17, 1775, British forces under General William Howe seized the Charlestown peninsula at the Battle of Bunker Hill. The Americans fell back, but British losses were so heavy that the attack was not followed up. The siege was not broken, and Gage was soon replaced by Howe as the British commander-in-chief.[9]

The militia converged on Boston, bottling up the British in the city. About 4,500 more British soldiers arrived by sea, and on June 17, 1775, British forces under General William Howe seized the Charlestown peninsula at the Battle of Bunker Hill. The Americans fell back, but British losses were so heavy that the attack was not followed up. The siege was not broken, and Gage was soon replaced by Howe as the British commander-in-chief.

In July 1775, newly appointed General Washington arrived outside Boston to take charge of the colonial forces and to organize the Continental Army. Realizing his army's desperate shortage of gunpowder, Washington asked for new sources. Arsenals were raided and some manufacturing was attempted; 90% of the supply (2 million pounds) was imported by the end of 1776, mostly from France.[10]

In July 1775, newly appointed General Washington arrived outside Boston to take charge of the colonial forces and to organize the Continental Army. Realizing his army's desperate shortage of gunpowder, Washington asked for new sources. Arsenals were raided and some manufacturing was attempted; 90% of the supply (2 million pounds) was imported by the end of 1776, mostly from France.

The standoff continued throughout the fall and winter. In early March 1776, heavy cannons that the Patriots had captured at Fort Ticonderoga were placed on Dorchester Heights by General Henry Knox. Since the artillery now overlooked the British positions, Howe's situation was untenable, and the British evacuated the city on March 17, 1776, sailing to their naval base at Halifax, Nova Scotia[2]. Washington then moved most of the Continental Army to fortify New York City.

The standoff continued throughout the fall and winter. In early March 1776, heavy cannons that the Patriots had captured at Fort Ticonderoga were placed on Dorchester Heights by General Henry Knox. Since the artillery now overlooked the British positions, Howe's situation was untenable, and the British evacuated the city on March 17, 1776, sailing to their naval base at Halifax, Nova Scotia[2]. Washington then moved most of the Continental Army to fortify New York City.